CORN Newsletter: 2005-17, June 14, 2005

Crop Recommendation and Observation Network by the Agronomic Crops Team


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C.O.R.N Newsletter 2005-17
June 14, 2005 - June 21, 2005

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Impact Of Hot Weather On Wheat Yields
by Patrick Lipps, Jim Beuerlein


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Wheat yields are generally greater during years with relatively cool temperatures during the grain filling period. This is one reason why some of the highest yields recorded in the U.S. are in the Pacific Northwest where the crop matures under 50 to 75 degree summer temperatures. In Ohio, wheat suffers from exposure to high temperatures during the grain filling period and in some years the high temperatures in June limit the number of days the grain fills by causing premature ripening of the crop. Generally, temperatures above about 85 degrees F are detrimental to wheat production.

In Ohio the grain filling period ranges from about 14 to 22 days and each day of grain fill adds about 4.5 bushels to the yield. When the weather is cool and there is little disease pressure the yield potential can be as high as about 6 bushels per acre per day of grain filling whereas during seasons with high disease pressure and high temperatures the potential can be reduced to about 3 bushels of grain per day of grain fill. Obviously the relationship between temperature, disease and potential yield more complicated that presented here complicated, but these are general trends. Although Ohio is now experiencing day time temperatures reaching into the 90 degree F range, there is very little disease affecting the wheat crop thought the state. If our experience is correct, then the effect of recent higher temperatures may not have a major effect on Ohio's wheat yields, although it will likely have some effect. Wheat in southern Ohio is now in its 19th to 21st day of grain filling and in most northern Ohio fields wheat has now had about 10 to 15 days of grain filling. Wheat in southern Ohio is showing signs of changing color so the end of the wheat season is drawing near in the south.

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C.O.R.N. is a summary of crop observations, related information, and appropriate recommendations for Ohio Crop Producers and Industry. C.O.R.N. is produced by the Ohio State University Extension Agronomy Team, State Specialists at The Ohio State University and Ohio Agricultural Research and Development Center. C.O.R.N. Questions are directed to State Specialists, Extension Associates, and Agents associated with Ohio State University Extension and the Ohio Agricultural Research and Development Center at The Ohio State University.

Information presented above and where trade names are used, they are supplied with the understanding that no discrimination is intended and no endorsement by Ohio State University Extension is implied. Although every attempt is made to produce information that is complete, timely, and accurate, the pesticide user bears responsibility of consulting the pesticide label and adhering to those directions.

All educational programs conducted by Ohio State University Extension are available to clientele on a nondiscriminatory basis without regard to race, color, creed, religion, sexual orientation, national origin, gender, age, disability or Vietnam-era veteran status.

Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, Keith L. Smith, Director, Ohio State University Extension.

TDD # 1 (800) 589-8292 (Ohio only) or (614) 292-1868


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